Twitter Isn't Getting Fitter

It hasn't gotten much easier to be a Twitter user. The same is true for Twitter investors.

The micromessaging service's struggle to jump-start user growth was thrown into the spotlight again on Thursday with the resignation of Chief Operating Officer Ali Rowghani. It is unclear whether Mr. Rowghani's departure resulted from anything more than internal politics. But the fact that he was in charge of Twitter's product team, tasked with...